The merit of the school of Lemmens and Widor is a very important organ reform in a time of musical decline. Yet Sietze de Vries has a strong and actually irrefutable point here. First learning to read notes and then learning to improvise is , properly speaking, not a good sequence. This scholastic method causes an organist without literature to sit awkwardly and empty-handed behind the keyboard. That is a decline. The comparison with learning a language seems very apt to me!